#   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
import sys


def video2frames(video_path, outpath, **kargs):
    def _dict2str(kargs):
        cmd_str = ""
        for k, v in kargs.items():
            cmd_str += " " + str(k) + " " + str(v)
        return cmd_str

    ffmpeg = ["ffmpeg ", " -y -loglevel ", " error "]
    vid_name = os.path.basename(video_path).split(".")[0]
    out_full_path = os.path.join(outpath, vid_name)

    if not os.path.exists(out_full_path):
        os.makedirs(out_full_path)

    # video file name
    outformat = os.path.join(out_full_path, "%08d.png")

    cmd = ffmpeg
    cmd = ffmpeg + [" -i ", video_path, " -start_number ", " 0 ", outformat]

    cmd = "".join(cmd) + _dict2str(kargs)

    if os.system(cmd) != 0:
        raise RuntimeError("ffmpeg process video: {} error".format(vid_name))

    sys.stdout.flush()
    return out_full_path


def frames2video(frame_path, video_path, r):
    ffmpeg = ["ffmpeg ", " -y -loglevel ", " error "]
    cmd = ffmpeg + [
        " -r ",
        r,
        " -f ",
        " image2 ",
        " -i ",
        frame_path,
        " -vcodec ",
        " libx264 ",
        " -pix_fmt ",
        " yuv420p ",
        " -crf ",
        " 16 ",
        video_path,
    ]
    cmd = "".join(cmd)

    if os.system(cmd) != 0:
        raise RuntimeError("ffmpeg process video: {} error".format(video_path))

    sys.stdout.flush()
